#include <TClass.h>
#include <TFile.h>
#include <TSystem.h>
+#include <TPRegexp.h>
#include "AliMagF.h"
#include "AliMagWrapCheb.h"
ClassImp(AliMagF)
const Double_t AliMagF::fgkSol2DipZ = -700.;
-const UShort_t AliMagF::fgkPolarityConvention = kConvLHC;
-
+const UShort_t AliMagF::fgkPolarityConvention = AliMagF::kConvLHC;
/*
Explanation for polarity conventions: these are the mapping between the
current signs and main field components in L3 (Bz) and Dipole (Bx) (in Alice frame)
positive L3 current -> positive Bz
positive Dip current -> positive Bx
3) kConvLHC : defined by LHC
- positive L3 current -> negative Bz
+ positive L3 current -> positive Bz
positive Dip current -> negative Bx
Note: only "negative Bz(L3) with postive Bx(Dipole)" and its inverse was mapped in 2005. Hence
the GRP Manager will reject the runs with the current combinations (in the convention defined by the
static Int_t AliMagF::GetPolarityConvention()) which do not lead to such field polarities.
+
+ -----------------------------------------------
+
+ Explanation on integrals in the TPC region
+ GetTPCInt(xyz,b) and GetTPCRatInt(xyz,b) give integrals from point (x,y,z) to point (x,y,0)
+ (irrespectively of the z sign) of the following:
+ TPCInt: b contains int{bx}, int{by}, int{bz}
+ TPCRatInt: b contains int{bx/bz}, int{by/bz}, int{(bx/bz)^2+(by/bz)^2}
+
+ The same applies to integral in cylindrical coordinates:
+ GetTPCIntCyl(rphiz,b)
+ GetTPCIntRatCyl(rphiz,b)
+ They accept the R,Phi,Z coordinate (-pi<phi<pi) and return the field
+ integrals in cyl. coordinates.
+
+ Thus, to compute the integral from arbitrary xy_z1 to xy_z2, one should take
+ b = b1-b2 with b1 and b2 coming from GetTPCInt(xy_z1,b1) and GetTPCInt(xy_z2,b2)
+
+ Note: the integrals are defined for the range -300<Z<300 and 0<R<300
*/
//_______________________________________________________________________
AliMagF::AliMagF():
}
//_______________________________________________________________________
-AliMagF::AliMagF(const char *name, const char* title, Int_t integ,
- Double_t factorSol, Double_t factorDip,
- Double_t fmax, BMap_t maptype, const char* path,
- BeamType_t bt, Double_t be):
+AliMagF::AliMagF(const char *name, const char* title, Double_t factorSol, Double_t factorDip,
+ BMap_t maptype, BeamType_t bt, Double_t be,Int_t integ, Double_t fmax, const char* path):
TVirtualMagField(name),
fMeasuredMap(0),
fMapType(maptype),
}
if (fInteg == 0) fPrecInteg = 0;
//
+ if (fBeamEnergy<=0 && fBeamType!=kNoBeamField) {
+ if (fBeamType == kBeamTypepp) fBeamEnergy = 7000.; // max proton energy
+ else if (fBeamType == kBeamTypeAA) fBeamEnergy = 2760; // max PbPb energy
+ AliInfo("Maximim possible beam energy for requested beam is assumed");
+ }
const char* parname = 0;
//
if (fMapType == k2kG) parname = fDipoleOFF ? "Sol12_Dip0_Hole":"Sol12_Dip6_Hole";
fSolenoid = GetBz(xyz);
SetFactorSol(factorSol);
SetFactorDip(factorDip);
- AliInfo(Form("Alice B fields: Solenoid %.0f kG (factor %+.2f), Dipole %s (factor %+.2f) %s",
- (fMapType==k5kG||fMapType==k5kGUniform)?5.:2.,factorSol,
- fDipoleOFF ? "OFF":"ON",factorDip,fMapType==k5kGUniform?" |Constant Field!":""));
- AliInfo(Form("Machine B fields for %s beam (%.0f GeV): QGrad: %.4f Dipole: %.4f",
- bt==kBeamTypeAA ? "A-A":(bt==kBeamTypepp ? "p-p":"OFF"),be,fQuadGradient,fDipoleField));
+ Print("a");
}
//_______________________________________________________________________
Bool_t AliMagF::LoadParameterization()
{
if (fMeasuredMap) {
- AliError(Form("Field data %s are already loaded from %s\n",GetParamName(),GetDataFileName()));
- return kTRUE;
+ AliFatal(Form("Field data %s are already loaded from %s\n",GetParamName(),GetDataFileName()));
}
//
char* fname = gSystem->ExpandPathName(GetDataFileName());
TFile* file = TFile::Open(fname);
if (!file) {
- AliError(Form("Failed to open magnetic field data file %s\n",fname));
- return kFALSE;
+ AliFatal(Form("Failed to open magnetic field data file %s\n",fname));
}
//
fMeasuredMap = dynamic_cast<AliMagWrapCheb*>(file->Get(GetParamName()));
if (!fMeasuredMap) {
- AliError(Form("Did not find field %s in %s\n",GetParamName(),fname));
- return kFALSE;
+ AliFatal(Form("Did not find field %s in %s\n",GetParamName(),fname));
}
file->Close();
delete file;
//_______________________________________________________________________
void AliMagF::InitMachineField(BeamType_t btype, Double_t benergy)
{
- if (btype==kNoBeamField || benergy<1.) {
+ if (btype==kNoBeamField) {
fQuadGradient = fDipoleField = fCCorrField = fACorr1Field = fACorr2Field = 0.;
return;
}
//_______________________________________________________________________
void AliMagF::GetTPCInt(const Double_t *xyz, Double_t *b) const
{
- // Method to calculate the integral of magnetic integral from xyz to nearest cathode plane
+ // Method to calculate the integral_0^z of br,bt,bz
b[0]=b[1]=b[2]=0.0;
if (fMeasuredMap) {
fMeasuredMap->GetTPCInt(xyz,b);
}
}
+//_______________________________________________________________________
+void AliMagF::GetTPCRatInt(const Double_t *xyz, Double_t *b) const
+{
+ // Method to calculate the integral_0^z of bx/bz,by/bz and (bx/bz)^2+(by/bz)^2
+ b[0]=b[1]=b[2]=0.0;
+ if (fMeasuredMap) {
+ fMeasuredMap->GetTPCRatInt(xyz,b);
+ b[2] /= 100;
+ }
+}
+
//_______________________________________________________________________
void AliMagF::GetTPCIntCyl(const Double_t *rphiz, Double_t *b) const
{
- // Method to calculate the integral of magnetic integral from point to nearest cathode plane
+ // Method to calculate the integral_0^z of br,bt,bz
// in cylindrical coordiates ( -pi<phi<pi convention )
b[0]=b[1]=b[2]=0.0;
if (fMeasuredMap) {
}
}
+//_______________________________________________________________________
+void AliMagF::GetTPCRatIntCyl(const Double_t *rphiz, Double_t *b) const
+{
+ // Method to calculate the integral_0^z of bx/bz,by/bz and (bx/bz)^2+(by/bz)^2
+ // in cylindrical coordiates ( -pi<phi<pi convention )
+ b[0]=b[1]=b[2]=0.0;
+ if (fMeasuredMap) {
+ fMeasuredMap->GetTPCRatIntCyl(rphiz,b);
+ b[2] /= 100;
+ }
+}
+
//_______________________________________________________________________
void AliMagF::SetFactorSol(Float_t fc)
{
default : return fFactorDip; // case kConvMap2005: return fFactorDip;
}
}
+
+//_____________________________________________________________________________
+AliMagF* AliMagF::CreateFieldMap(Float_t l3Cur, Float_t diCur, Int_t convention, Bool_t uniform,
+ Float_t beamenergy, const Char_t *beamtype, const Char_t *path)
+{
+ //------------------------------------------------
+ // The magnetic field map, defined externally...
+ // L3 current 30000 A -> 0.5 T
+ // L3 current 12000 A -> 0.2 T
+ // dipole current 6000 A
+ // The polarities must match the convention (LHC or DCS2008)
+ // unless the special uniform map was used for MC
+ //------------------------------------------------
+ const Float_t l3NominalCurrent1=30000.; // (A)
+ const Float_t l3NominalCurrent2=12000.; // (A)
+ const Float_t diNominalCurrent =6000. ; // (A)
+
+ const Float_t tolerance=0.03; // relative current tolerance
+ const Float_t zero=77.; // "zero" current (A)
+ //
+ BMap_t map = k5kG;
+ double sclL3,sclDip;
+ //
+ Float_t l3Pol = l3Cur > 0 ? 1:-1;
+ Float_t diPol = diCur > 0 ? 1:-1;
+
+ l3Cur = TMath::Abs(l3Cur);
+ diCur = TMath::Abs(diCur);
+ //
+ if (TMath::Abs((sclDip=diCur/diNominalCurrent)-1.) > tolerance && !uniform) {
+ if (diCur <= zero) sclDip = 0.; // some small current.. -> Dipole OFF
+ else {
+ AliFatalGeneral("AliMagF",Form("Wrong dipole current (%f A)!",diCur));
+ }
+ }
+ //
+ if (uniform) {
+ // special treatment of special MC with uniform mag field (normalized to 0.5 T)
+ // no check for scaling/polarities are done
+ map = k5kGUniform;
+ sclL3 = l3Cur/l3NominalCurrent1;
+ }
+ else {
+ if (TMath::Abs((sclL3=l3Cur/l3NominalCurrent1)-1.) < tolerance) map = k5kG;
+ else if (TMath::Abs((sclL3=l3Cur/l3NominalCurrent2)-1.) < tolerance) map = k2kG;
+ else if (l3Cur <= zero && diCur<=zero) { sclL3=0; sclDip=0; map = k5kGUniform;}
+ else {
+ AliFatalGeneral("AliMagF",Form("Wrong L3 current (%f A)!",l3Cur));
+ }
+ }
+ //
+ if (sclDip!=0 && map!=k5kGUniform) {
+ if ( (l3Cur<=zero) || ((convention==kConvLHC && l3Pol!=diPol) || (convention==kConvDCS2008 && l3Pol==diPol)) ) {
+ AliFatalGeneral("AliMagF",Form("Wrong combination for L3/Dipole polarities (%c/%c) for convention %d",
+ l3Pol>0?'+':'-',diPol>0?'+':'-',GetPolarityConvention()));
+ }
+ }
+ //
+ if (l3Pol<0) sclL3 = -sclL3;
+ if (diPol<0) sclDip = -sclDip;
+ //
+ BeamType_t btype = kNoBeamField;
+ TString btypestr = beamtype;
+ btypestr.ToLower();
+ TPRegexp protonBeam("(proton|p)\\s*-?\\s*\\1");
+ TPRegexp ionBeam("(lead|pb|ion|a)\\s*-?\\s*\\1");
+ if (btypestr.Contains(ionBeam)) btype = kBeamTypeAA;
+ else if (btypestr.Contains(protonBeam)) btype = kBeamTypepp;
+ else AliInfoGeneral("AliMagF",Form("Assume no LHC magnet field for the beam type %s, ",beamtype));
+ char ttl[80];
+ snprintf(ttl,79,"L3: %+5d Dip: %+4d kA; %s | Polarities in %s convention",(int)TMath::Sign(l3Cur,float(sclL3)),
+ (int)TMath::Sign(diCur,float(sclDip)),uniform ? " Constant":"",
+ convention==kConvLHC ? "LHC":"DCS2008");
+ // LHC and DCS08 conventions have opposite dipole polarities
+ if ( GetPolarityConvention() != convention) sclDip = -sclDip;
+ //
+ return new AliMagF("MagneticFieldMap", ttl,sclL3,sclDip,map,btype,beamenergy,2,10.,path);
+ //
+}
+
+//_____________________________________________________________________________
+const char* AliMagF::GetBeamTypeText() const
+{
+ const char *beamNA = "No Beam";
+ const char *beamPP = "p-p";
+ const char *beamPbPb= "Pb-Pb";
+ switch ( fBeamType ) {
+ case kBeamTypepp : return beamPP;
+ case kBeamTypeAA : return beamPbPb;
+ case kNoBeamField:
+ default: return beamNA;
+ }
+}
+
+//_____________________________________________________________________________
+void AliMagF::Print(Option_t *opt) const
+{
+ // print short or long info
+ TString opts = opt; opts.ToLower();
+ AliInfo(Form("%s:%s",GetName(),GetTitle()));
+ AliInfo(Form("Solenoid (%+.2f*)%.0f kG, Dipole %s (%+.2f) %s",
+ GetFactorSol(),(fMapType==k5kG||fMapType==k5kGUniform)?5.:2.,
+ fDipoleOFF ? "OFF":"ON",GetFactorDip(),fMapType==k5kGUniform?" |Constant Field!":""));
+ if (opts.Contains("a")) {
+ AliInfo(Form("Machine B fields for %s beam (%.0f GeV): QGrad: %.4f Dipole: %.4f",
+ fBeamType==kBeamTypeAA ? "A-A":(fBeamType==kBeamTypepp ? "p-p":"OFF"),
+ fBeamEnergy,fQuadGradient,fDipoleField));
+ AliInfo(Form("Uses %s of %s",GetParamName(),GetDataFileName()));
+ }
+}
git://git.uio.no / u / mrichter / AliRoot.git / blobdiff